Effective cosmological "constant " and quintessence

Abstract

In this paper we present exactly solved extended quintessence models; furthermore, through a dynamical effective Q-cosmological "constant", we recover some of the L decaying cases found in the literature. Finally we introduce a sort of complementarity between the Q-dominated or L-dominated expansions of the Universe.

11 LaTeX Pages, including 4 Encapsulated Postscript Figures, submitted to Phys. Rev. Letter

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• Scalar Field Dark Energy Perturbations and their Scale Dependence
• On exact solutions for quintessential (inflationary) cosmological models with exponential potentials
• Why Does Gravity Ignore the Vacuum Energy?
• Understanding the origin of CMB constraints on Dark Energy
• Gauge invariant perturbations of Scalar-Tensor Cosmologies: The vacuum case
• Cosmological models in scalar tensor theories of gravity and observations: a class of general solutions
• Evolution of perturbations in distinct classes of canonical scalar field models of dark energy
• Variable G and $\Lambda$: scalar-tensor versus RG-improved cosmology
• Cosmological Parameter Determination from Counts of Galaxies
• The evolution of tensor perturbations in scalar-tensor theories of gravity